package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class shoppingCartAddImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetMealMapper setMealMapper;

    /**
     * 购物车添加
     * @param shoppingCartDTO
     */
    @Override
    public void shoppingCartAdd(ShoppingCartDTO shoppingCartDTO) {

        //判断当前加入到购物车中的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);


        //如果存在，需要数量加1
        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //如果不存在就进行新增插入操作

            //判断本次添加为套餐还是菜品
            Long dishId = shoppingCart.getDishId();
            if(dishId != null){
                //本次添加为菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setName(dish.getName());

            }else {
                //本次添加为套餐
                Long setMealId = shoppingCart.getSetmealId();
                Setmeal setmeal = setMealMapper.getById(setMealId);
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setName(setmeal.getName());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        List<ShoppingCart> list = shoppingCartMapper.getAll(userId);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.DeleteAll(userId);
    }

    /**
     * 删除购物车中的一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            Integer number = cart.getNumber();
            if(number == 1){
                shoppingCartMapper.subShoppingCart(shoppingCartDTO);
            }else {
                cart.setNumber(number - 1);
                shoppingCartMapper.updateNumberById(cart);
            }
        }
    }

}
